Re: [fetch] Operate on internal response (#23)

So for HTTP Fetch we need to acknowledge there's a response and potentially an internal response. If there's an internal response we want to check the internal response's status, headers, etc. in that algorithm.

For fetch step 11 I think we should basically skip responses that already have an internal response (i.e. that are filtered responses). Combined with HTTP Fetch step 2.2 that works fine I think.

@nikhilm @jakearchibald @wanderview am I missing anything?

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